Joined: Jan. 2006
|Now some will ask, "This is great, Dave, but can he PROVE that Cessna made the airplane? Well, no. Has he ever OBSERVED any aircraft factory building airplanes? No again.|
However, it was still a valid hypothesis because it makes the falsifiable, verifiable prediction that, if he chose to go to the factory, he would see planes being made that were identical in style to his. Likewise, the conjecture that the aerodynamics book was accurate is falsifiable - he could go away and build a bunch of toy aircraft and compare their flight with the book's claims, for example.
In general, the only time we take a statement on trust is when we can reasonably expect that it would have been falsified were it not true. Or when we have absolutely no other option. Abduction is rarely more than half the story, and in science it's generally not even that.